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Earnings Per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Vote
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
Vote
shares
Jun. 30, 2014
USD ($)
shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Percentage of earnings or losses assumed in calculation (in hundredths) 100.00%   100.00%  
Preferential dividend rate of dividend paid on Class A Common Stock (in hundredths)     105.00%  
Common Stock [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share | Vote 1   1  
Numerator [Abstract]        
Distributed earnings $ 1,651 $ 1,642 $ 3,297 $ 3,253
Undistributed earnings 2,761 2,748 6,698 6,659
Basic 4,412 4,390 9,995 9,912
Class A Common earnings 421 439 957 1,046
Diluted $ 4,833 $ 4,829 $ 10,952 $ 10,958
Denominator [Abstract]        
Weighted average shares outstanding - basic (in shares) | shares 20,600 20,454 20,585 20,307
Assumed conversion of Class A Common Stock (in shares) | shares 2,079 2,162 2,080 2,259
Dilutive options, awards and common stock equivalents (in shares) | shares 276 324 302 368
Total weighted-average diluted Common Stock (in shares) | shares 22,955 22,940 22,967 22,934
Class A Common [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Number of votes per share | Vote 10   10  
Numerator [Abstract]        
Distributed earnings $ 156 $ 162 $ 312 $ 340
Undistributed earnings 265 277 645 706
Class A Common earnings $ 421 $ 439 $ 957 $ 1,046
Denominator [Abstract]        
Weighted average shares outstanding (in shares) | shares 2,079 2,162 2,080 2,259